[flang-commits] [flang] [flang] Do not error on constant nonzero UB in substring of ZLA (PR #174511)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

@tmjbios , did you run Fortran tests from llvm-test-suite with this change?

https://github.com/llvm/llvm-project/pull/174511